Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices-Human models instrumentation and procedures Part 1:Procedure to determine the s
1 Scope
This part specifies the specific absorption rate (SAR) for transmitting device intended to be used with the radiating part of the device in close proximity to the ear.
This applies to any electromagnetic field (EMF) transmitting device with frequency range from 300 MHz to 3 GHz, including mobile phones, cordless phones, etc.
The objective of this standard is to specify the measurement method for demonstration of compliance with the specific absorption rate (SAR) limits for such devices. This part is just the standard about electromagnetic radiation measurement method, rather than the standard about safety limit.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies
ISO Guide-1995 Guide to the Expression of Uncertainty in Measurement
ISO/IEC 17025-1999 General Requirements for the Competence of Testing and Calibration Laboratories
3 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
3.1
attenuation coeffcicent
numerical factor intended to account for attenuation due to the human head or body tissue between the source and a specified point
3.2
average (temporal) absorbed power
value of the time-averaged rate of energy transfer given by
(3-1)
Where
P(—)avg——the average power in watts;
t1——the start time of the exposure in seconds;
t2——the stop time of the exposure in seconds;
t2-t1——the exposure duration in seconds;
P(t) ——the instantaneous absorbed power in watts;
3.3
axial isotropic
the maximum deviation of the SAR when rotating around the major axis of the probe cover/case while the probe is exposed to a reference wave impinging from a direction along the probe major axis
3.4
basic restriction
restrictions on human exposure to time-varying electric, magnetic, and electromagnetic fields that are based directly on established health effects
NOTE Within the frequency range of this standard, the physical quantity used as a basic restriction is the specific absorption rate (SAR).
3.5
boundary effect (probe)
a change in the sensitivity of an electric-field probe when the probe is located close to (less than one probe-tip diameter) media boundaries
3.6
complex permittivity
the ratio of the electric flux density in a medium to the electric field strength at a point. The permittivity of biological tissues is frequency dependent.
Foreword I
1 Scope
2 Normative References
3 Terms and definitions
4 Symbols and Abbreviated Terms
5 Measurement System Specifications
6 Protocol for SAR Assessment
7 Uncertainty Estimation
8 Measurement Report
Annex A (Normative) Phantom Specifications
Annex B (Normative) Calibration of the Measurement Instrumentation and Uncertainty Estimation
Annex C (Normative) Post-processing Techniques and Uncertainty Estimation
Annex D (Normative) SAR Measurement System Validation
Annex E (Informative) Interlaboratory Comparisons
Annex F (Informative) Definition of a Phantom Coordinate System and a Device Under Test Coordinate System
Annex G (Informative) Validation Dipoles
Annex H (Informative) Flat Phantom
Annex I (Informative) Recommended Recipes for Phantom Head Tissue Equivalent Liquids
Annex J (Informative) Measurement of the dielectric properties of liquids and uncertainty estimation
Bibliography
